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Resorcin[4]arene and tetramethylated resorcin[4]arene form complexes with l-carnitine, whose crystal structures were determined. Each complex contains two carnitine ligands in the asymmetric unit, each of which is incorporated into the cavity of the macrocyclic receptor through cation–π interactions between the trimethylammonium moiety of the ligand and π–rings of the receptor.

The first total syntheses of JBIR-06 and two analogous depsipeptides, 12-membered antimycin-class antibiotics, have been accomplished via Shiina macrolactonization. Comparison of the spectroscopic data of the synthesized compounds with those reported for natural products verified that the absolute configutation of the natural products was (2S, 4S, 6S, 7R, 14S).